Switched-mode power supply, electric vehicle battery system, and vehicle

Abstract

This application discloses a switched-mode power supply including a voltage isolation module, a voltage regulator module, a voltage converter circuit, a first switch, and an electric vehicle battery monitoring module; the voltage isolation module has an input connected to an electric vehicle battery and an output connected to an input terminal of the voltage regulator module. An output terminal of the voltage regulator module is connected to an input terminal of the voltage converter circuit, an output terminal of the voltage converter circuit is connected to one terminal of the first switch, and another terminal of the first switch is connected to the electric vehicle battery monitoring module; and when the switched-mode power supply is in a low-power state, the first switch turns on and off intermittently according to a clock signal received, so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently.

What is claimed is: 
     
       1. A switched-mode power supply, comprising a voltage isolation module, a voltage regulator module, a voltage converter circuit, a first switch, and an electric vehicle battery monitoring module; wherein:
 an input of the voltage isolation module is connected to an electric vehicle battery, an output of the voltage isolation module is connected to an input terminal of the voltage regulator module, an output terminal of the voltage regulator module is connected to an input terminal of the voltage converter circuit, an output terminal of the voltage converter circuit is connected to one terminal of the first switch, and another terminal of the first switch is connected to the electric vehicle battery monitoring module; and 
 in response to the switched-mode power supply entering a low-power state in which the switched-mode power supply has relatively low but non-zero power consumption within a preset period of time, the first switch turns on and off intermittently according to a clock signal received, so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently; 
 wherein the electric vehicle battery monitoring module monitors the electric vehicle battery when the first switch turns on and stops monitoring the electric vehicle battery when the first switch turns off. 
 
     
     
       2. The switched-mode power supply according to  claim 1 , further comprising a clock module, wherein
 an output terminal of the voltage converter circuit is connected to the clock module, and one terminal of the first switch is further connected to the clock module; and 
 the clock module is configured to: when the switched-mode power supply is in a low-power state, control the first switch to turn on and off intermittently so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently. 
 
     
     
       3. The switched-mode power supply according to  claim 2 , further comprising a control module, wherein the control module is connected to the clock module and the first switch;
 the control module is configured to send a low power signal to the clock module upon reception of a low power trigger signal; and 
 the clock module is further configured to: after receiving the low power signal, control the first switch to turn on and off intermittently so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently. 
 
     
     
       4. The switched-mode power supply according to  claim 1 , wherein the first switch is further connected to an external clock trigger module, wherein
 the external clock trigger module is configured to: when the switched-mode power supply is in a low-power state, control the first switch to turn on and off intermittently so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently. 
 
     
     
       5. The switched-mode power supply according to  claim 1 , wherein the voltage isolation module comprises a voltage divider resistor and an isolation switch (S 2 ), wherein
 one terminal of the voltage divider resistor is connected to a positive electrode of the electric vehicle battery, the other terminal of the voltage divider resistor is connected to an input terminal of the isolation switch (S 2 ), an output terminal of the isolation switch (S 2 ) is connected to the voltage regulator module, and a power input terminal of the isolation switch (S 2 ) is connected to the output terminal of the voltage converter circuit. 
 
     
     
       6. The switched-mode power supply according to  claim 5 , wherein the output terminal of the voltage converter circuit is further connected to the power input terminal of the isolation switch (S 2 ) and is configured to provide a first voltage to the isolation switch (S 2 ). 
     
     
       7. The switched-mode power supply according to  claim 2 , wherein the voltage converter circuit comprises a first DC-to-DC converter and a second DC-to-DC converter, wherein
 an input terminal of the first DC-to-DC converter is connected to the output terminal of the voltage regulator module, an output terminal of the first DC-to-DC converter is connected to one terminal of the first switch and an input terminal of the second DC-to-DC converter, and an output terminal of the second DC-to-DC converter is connected to the clock module. 
 
     
     
       8. The switched-mode power supply according to  claim 6 , further comprising an external auxiliary wakeup module, wherein
 the external auxiliary wakeup module is configured to receive an external auxiliary wakeup signal and output a second voltage to the input terminal of the isolation switch (S 2 ). 
 
     
     
       9. The switched-mode power supply according to  claim 8 , wherein the external auxiliary wakeup module is further configured to receive an external auxiliary wakeup signal and output a second voltage to the electric vehicle battery monitoring module. 
     
     
       10. The switched-mode power supply according to  claim 8 , wherein the external auxiliary wakeup module comprises a wakeup regulator circuit and a wakeup DC-to-DC converter module, wherein an output terminal of the wakeup regulator circuit is connected to an input terminal of the wakeup DC-to-DC converter module, and an output terminal of the wakeup DC-to-DC converter module is connected to the power input terminal of the isolation switch (S 2 ). 
     
     
       11. An electric vehicle battery system, comprising the switched-mode power supply according to  claim 1 . 
     
     
       12. A vehicle, comprising:
 a vehicle body and the electric vehicle battery system according to  claim 11 , 
 wherein the electric vehicle battery system is disposed in the vehicle body. 
 
     
     
       13. A switched-mode power supply, comprising a voltage isolation module, a voltage regulator module, a voltage converter circuit, a first switch, and an electric vehicle battery monitoring module; wherein:
 an input of the voltage isolation module is connected to an electric vehicle battery, an output of the voltage isolation module is connected to an input terminal of the voltage regulator module, an output terminal of the voltage regulator module is connected to an input terminal of the voltage converter circuit, an output terminal of the voltage converter circuit is connected to one terminal of the first switch, and another terminal of the first switch is connected to the electric vehicle battery monitoring module; 
 when the switched-mode power supply is in a low-power state, the first switch turns on and off intermittently according to a clock signal received, so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently; and 
 the voltage isolation module comprises a voltage divider resistor and an isolation switch, wherein an output terminal of the voltage converter circuit is connected to a power input terminal of the isolation switch and is configured to provide a first voltage to the isolation switch. 
 
     
     
       14. A switched-mode power supply, comprising a voltage isolation module, a voltage regulator module, a voltage converter circuit, a first switch, an electric vehicle battery monitoring module, and a clock module; wherein:
 an input of the voltage isolation module is connected to an electric vehicle battery, an output of the voltage isolation module is connected to an input terminal of the voltage regulator module, an output terminal of the voltage regulator module is connected to an input terminal of the voltage converter circuit, an output terminal of the voltage converter circuit is connected to one terminal of the first switch, and another terminal of the first switch is connected to the electric vehicle battery monitoring module; 
 the voltage converter circuit comprises a first DC-to-DC converter and a second DC-to-DC converter, wherein:
 an input terminal of the first DC-to-DC converter is connected to the output terminal of the voltage regulator module, an output terminal of the first DC-to-DC converter is connected to one terminal of the first switch and an input terminal of the second DC-to-DC converter, and an output terminal of the second DC-to-DC converter is connected to the clock module; and 
 
 when the switched-mode power supply is in a low-power state, the first switch turns on and off intermittently according to a clock signal received, so that the electric vehicle battery monitoring module monitors the electric vehicle battery intermittently.